<meta charset="utf-8">
(#) Kapt usage should be replaced with KSP

!!! WARNING: Kapt usage should be replaced with KSP
   This is a warning.

Id
:   `KaptUsageInsteadOfKsp`
Summary
:   Kapt usage should be replaced with KSP
Severity
:   Warning
Category
:   Performance
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   8.1.0 (July 2023)
Affects
:   Gradle build files
Editing
:   This check runs on the fly in the IDE editor
See
:   https://developer.android.com/studio/build/migrate-to-ksp
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/GradleDetector.kt)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/GradleDetectorTest.kt)

KSP is a more efficient replacement for kapt. For libraries that support
both, KSP should be used to improve build times.

!!! Tip
   This lint check has an associated quickfix available in the IDE.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
build.gradle:9:Warning: This library supports using KSP instead of kapt,
which greatly improves performance. Learn more:
https://developer.android.com/studio/build/migrate-to-ksp
[KaptUsageInsteadOfKsp]
  kapt 'androidx.room:room-compiler:2.5.0'
  ----------------------------------------
build.gradle:10:Warning: This library supports using KSP instead of
kapt, which greatly improves performance. Learn more:
https://developer.android.com/studio/build/migrate-to-ksp
[KaptUsageInsteadOfKsp]
  kapt "androidx.room:room-compiler:$room_version"
  ------------------------------------------------
build.gradle:13:Warning: This library supports using KSP instead of
kapt, which greatly improves performance. Learn more:
https://developer.android.com/studio/build/migrate-to-ksp
[KaptUsageInsteadOfKsp]
  kapt 'com.github.bumptech.glide:compiler:4.14.2'
  ------------------------------------------------
build.gradle:14:Warning: This library supports using KSP instead of
kapt, which greatly improves performance. Learn more:
https://developer.android.com/studio/build/migrate-to-ksp
[KaptUsageInsteadOfKsp]
  kapt("com.github.bumptech.glide:compiler:glide_version")
  --------------------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here is the source file referenced above:

`build.gradle`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~groovy linenumbers
plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-kapt'
    id 'com.google.devtools.ksp'
}
dependencies {
  def room_version = "2.5.0"
  kapt 'androidx.room:room-compiler:2.5.0'
  kapt "androidx.room:room-compiler:$room_version"

  def glide_version = "4.14.2"
  kapt 'com.github.bumptech.glide:compiler:4.14.2'
  kapt("com.github.bumptech.glide:compiler:glide_version")
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/GradleDetectorTest.kt)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `GradleDetector.testKaptToKspMigration`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Using a suppression comment like this on the line above:

  ```kt
  //noinspection KaptUsageInsteadOfKsp
  problematicStatement()
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="KaptUsageInsteadOfKsp" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'KaptUsageInsteadOfKsp'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore KaptUsageInsteadOfKsp ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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